Is there a way to Time Delay a Constraint (Like Slow Parent)
The Animation Nodes plugin can be used to generate objects and it has a Delay Falloff node which can transform them in sequence.

This series on youtube has an example.

Example based on link above:


Line Mesh is used to generate the locations
Object Instancer generates the cubes
Replicate Matrix generates transform matrices from the positions
Offset Matrix rotates each item, the delay falloff does them in sequence